Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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No 5.1 audio on HDMI ARC from the TCL49S517 Roku tv

Greetings! I have a new Roku TV TCL 49s517 connected to an Emotiva surround sound preamp umc-200, with HDMI ARC. I also have a dish Network receiver connected to the new TV via HDMI. I have all the correct menu settings in the TV & Emotiva to enable HDMI ARC.

The problem now is that it seems to be only sending a Dolby Digital 2.0 signal back to my Emotiva. On the TVs audio settings, when I try to enable Auto detect I get a clicking sound. So the only setting it will allow me to set is Stereo PCM or Dolby Digital. I have it set to Dolby Digital yet it is still only sending stereo 2.0 signal through the ARC back to the Emotiva. Can anyone help? Many thanks for your time.
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